Automatic screw-machine.



No. 876,814. PATENTED JAN. 14, 1908. H. B. LESTER.

AUTOMATIC SCREW MACHINE.

APPLICATION FILED JUNE 16.1905.

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PATBNTED JAN. 14, 1908.

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H B LESTER AUTOMATIC SCREW MACH APPLICATION FILED JUNE 16 1906 4 2 v 2% I x I 1mm, .cv r I No. 876,814. PATENTED JAN. 14, 1908.

H. B. LESTER. AUTOMATIC SQREW MACHINE.

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No. 876,814. PATENTED JAN. 14, 1908. H. B. LESTER.

AUTOMATIC SCREW MACHINE.

APPLICATION FILED JUNE 16.1905.

- 6 SHEETS-SHEET 5.

No. 876,814. PATENTED JAN. 14, 1908.

H. B. LESTER. AUTOMATIC SCREW MACHINE.

APPLIG ATION FILED JUNE 16.1905.

6 SHEETS-SHEET 6 UNITED STATES PATENT orFion.

HARRY LESTER, OF WEST HARTFORD, CONNECTICUT.

AUTOMATIC SCREW-MACHINE.

Specification of Letters Patent.

Patented Jan. 14, 1908.

Application filed June 16v1905i Serial No. 265.596.

To all whom it may concern:

Be it known that I, HARRY B. LESTER, a citizen of the 'United States, residing at West Hartford, in the county of Hartford and State of Connecticut, have invented a .new and useful Automatic Screw-Machine,

of which the following is a specification.

This invention a pertains to an automatic screw machine of 't' e multiple tubular spindle type.

The object of the invention is to roduoe a simple, compact, easily 0)erate( screw machine of wldescope and igh efliclency having tubular spindles that always ropieces or pieces of different lengths, (.iameters andshapes that require but a simple cut, or to feed progressively in order that the stock maybe successively o erated upon by a number of different tool which will effect a variety of cuts on each piece.

A further object is to so arrange the mechanisms that they will be above and away from the grit produced by cutting the stock, that the spindle bearings will be widely separated to obviate rocking strains due, torapidly rotating rods, and. that all the driving be direct and positive without the interposition of levers, and a plied in such manner' that the tools are relieved of interfering and distorting strains, thus insuring accurate cuts at a high rate of speed. with a minimumexpenditure of power.

Figure 1 of the accompanying drawings shows a front elevation of\ a machine-that embodies the invention. I Fig. '2 shows av central vertical section of the s indle head. Fig. 3 is a view looking toward t e left-hand end of the spindle head, as indicated by the arrow- 3 on Fig. 2. Fig. 4 is a view looking toward the right-hand end of the spindle head, as indicated by the arrow 4 on Fig. 2.

Fig. 5 shows avertical-transverse section of the spindle head on 55 of Fig. 2, looking in the direction indicated by the arrows. Fig. 6 is a sectional view on larger scale of the forward. end of one of the spindles. Fig. 7 is a sectional view of a portion of one of the spindles on a plane at right angles to that of Fig. 6. Fig. 8 is a plan of one end of v a chuck closing wedge sleeve showing its cam groove and the studs that cooperate to reciprocate this sleeve and effect the closing and opening of the chuck. Fig. 9- shows a plan of the sleeve which is utilized to cause all of the chucks to operate simultaneously; view of this sleeve.

Fig 10 shows an en Fig. -11 shows a central vertical section of the threading tool head. Fig. 12 is ahorizontal section through the threading tool head on the. plane indicated by 12-12 on Fig. 11, looking in the direction pointed by the arrows.

Fig. 13 is a view looking toward the left-hand end of the threading tool head, as indicated by the arrow 13 on 'Fig. 11.

Fig. 14 is a view looking toward the right- I hand end of the threading tool head, as indicated by the arrow 14 on Fig. 11. shows a detail of the spindle head indexing mechanism.

Fig. 15.

In the machine illustrated there are five I rotary and revoluble tubular spindles 16. Each spindle is supported near its forward end by a bushing 17 and near its rear end by a bushing '18 in openings in the forward and rear ends of the skeleton or spider-like s indle head 19 that is rotarily supported in tlie casing 20 (Figs. 2,. 5).

In each spindle is a lining tube 21 and a feed tube 22. The forward end of the feed tube is connected witha split sleeve 23. The jaws of this sleeve are designed to frlctionally' grasp the stock and feed it forward through the spindle. Screwed upon the rear end of the feed ..tube is a sleeve 24 which has a flange 25. Screwed upon the threaded outer surface of this sleeve is a collar 26. The inner feed tubes for feeding stock are successively moved forward by the engagement with the flanges 25 of a single roll 27 or simultaneously moved forward by the engage'ment with. the flanges 25 of the five rolls. 28, according to the adjustment of the collarv 29 bearing the rolls that is adjustably connected with a disk '30 which is fastened to the reciprocatory shaft 31.

The exact amount of forward movement of the feed tubes is" letermined by the adjustment of the, flange-sleeves upon. the tubes. The feed tubes are drawn back on the stock successively or simultaneously by the en.

gagenient with the collars 26 of the roll 27 or the/rolls 28, according to the adjustment of the collar 29. The amount of rearward movement of the tubes is determmed by the .adjustme nt of the collars on the sleeves.

The peripheries of the collars 26 are preferably'graduated and index fingers 32 are arranged on the sleeves so that accurate'adjustment may be readily obtained (Figs. 2, 3).

The collar 29 is connected with the disk 30 by a binding screw 33 that extends through a slot in. the disk. The five rolls 28 are equally s aced about the roll collar and the single rol 27 is located between two of the other rolls. When the binding screw is loosened the roll collar may be turned so that the single roll 27 will lie between the flange and the collar 26 on the feed tube of each spindle successively as the spindles revolve with the head and reach the locality .of'the single roll, and then the rolls 28 will be intermediate of the spindles and will not engage with any of the feed tube flanges and co ars, or the roll collar may be turned so that the rolls 28 will lie between the feed tube flanges and collars of all of the spindles.

In the first instance, when the single rollis between the flange and collar of one spindlethe reci ocation of the shaft 31 reciprocates the feedl tube of that one spindle-only and then only one rod is fed forward. In the second instance, when the collar is turned so that the five rolls lie between the flanges and collars of all'of the spindles the reciprocation of the shaft .31 reci rocates the feed tubes of all of the spind es and feeds five rods chuck to clam the s indle.

the evers'release the clutch closing sleeve forward simultaneously- (Figs. 2, 3).

' The forward endof each lining tube 21 butts against the rear end-ofa chuck 34 and the rear end of this tube butts against a cap 35 that is screwed upon the rear end of the s indle. By turning the cap the position of t e chuck may be adjusted, Between each'.

spindle and chuck is a chuck closing sleeve 36. This sleeve is thrust forward bya spiral spring 37 and when forward the chuck jaws spring open (Figs. 2, 6). i

Fastened to each s in'dle is a collar 38 allowing the spring to force it forward so that the clutch will unclamp thestock- (Figs.

The movements are so timed that the chucks clam and hold the rods of stock while the too s are cutting and when the feed tubes are drawn back and only release the stock so that the forward movement ofthe feed tubes will feed fresh stock.

The openings 43 in the chuck closing sleeve tates with the spindle. I

into which project the screw studs 41 that connect the collar with the chuck closing sleeve are made in the form of bayonet slots so that by giging the sleeve a partial rotation it may be drawn out from the spindle leaving the-chuck and the s lit feed sleeve free to be removed if desired or repairs or renew'al'or changing the size (Figs. 6, 7).

The shaft 31 which, according to the adjustment of the roll collar 29, causes the reciprocation of one or all of the feed tubes extends forwardly through and is fastened'to the tubular hub 44 of a tool holder 45 that is movable longitudinally in the casing 46. A rack 47 is fastened to this hub and meshing with this rack isa gear 48 which meshes with a rack 49 on the reciprocatory shaft50' (Fig. 11). This shaft extends from the casing 46 back into the casing 20 where its end is preferably squared so that the shaft will not rotate. The squared end of the shaft 50 bears a roll 51 that is "adapted 'to be engaged by cam blocks '52 and 53 secured to the cam drum 54 which is loosely mounted on a cylil1- der 75that surrounds and is fastened to the spindle head (Figs. 1, 2). On the cam drum is a worm wheel 55 in mesh with which is a worm 56 on a shaft 57 that extends from front 'to back and is provided at the back with adriving pulley 58. The shaft 57 :is arranged to be connected with'the pulley 58 by a clutch 59 (Fi s. 2,5). When the clutch connects the pulley with the worm shaft the worm will rotate the worm wheel and the cam block on'the cam drum that bears the worm wheel will reci rocate the shaft 50 which will in turn osci ate the ear 48 and cause a reciprocation of the tool older 45 and shaft 31 which, according to the position of the roll collar 29, reciprogsittes one or all of the feed tubes in the spines. I Extending around the rear end of the cam drum is a flange 60 in which is a T-shaped groove 61 (Fig. 2), and adjustably fastened to this grooved flange at any desired locality around the cam drum are two blocks 62 and 63 which carry studs 64 that are normally sleeve containing the cam groove is mounted on the chuck closing wedge-in such manner that when'it is moved longitudinally it moves the chuck closing wedge but it does not rotate with the chuck closing wedge which ro- Fas-tened to the inside of the casing 20,is a short segmental wedge 68 (Fig. 5). The inner edge of this wedge projects in such manner that it engages the heads of the studs and forces them inwardly against thethrust of the springs when during the rotation of the cam drum the studs pass the wedge. When pressed. outwardly bysprings 65 (Figs. 2, 5).

the studs are thus forced inwardly their inner ends enter the cam groove in the chuck closing wedge sleeve that is beneath them,

dividually in succession as the spindles re volve with the s indle head. v Loose on the s aft 31 in the rear end of the spindle head is a sleeve 70. A feather 71 extends from the roll collar 29 on the shaft 31 into a key-way in the sleeve so that when that collar is turned this sleeve will also be turned. This sleeve, however, is not reciprocated by the shaft 31 (Fig. 2).

Near the front end the sleeve 70 has anannular groove 72 and longitudinal mortises 73 (Figs. 9, 10). A lug 74 extends inwardly from each chuck closing wedge sleeve 66 into the groove 72 in the sleeve 7 0 (Figs. 2, 5). The mortises in the end of the sleeve are so: arranged that when the collar 29 is in such position that the single roll 27 will engage a feed tube flange and collar and reciprocate but one feedtube the lugs will be opposite the mortises and the movement of one chuck closing wedge sleeve will not affe ct the movement'of the others. However, when'the collar 29 is so turned that the five rolls 28 engage the feed tubeflanges and collars and cause the reciprocation of all of.

the feed tubesat the same time the sleeve 70 will be so turned that the lugs 7 4 are not opposite themortises but opposite the solid end of the sleeve between the mortises. With the sleeve 70 in this position the forward and backward movement of the lug projecting from the chuck closing wedge sleeve that is reciprocated by the cam studs reciprocates the sleeve and by the engagement of the sleeve with all of the lugs causes a reciprocation of all of the chuck closing wedge sleeves and all of'the connectedchuck wedges, that is, when the collar 29 is set so that thefeed tubes feed the stock rods one at a time as they come around the chucks are operated one at a time but when the collar 29 is set so that all of the feed tubes feed rods of stock at the same time, the operation of one-chuck operates all of the chucks si-- multaneously'.

Mounted on two bushings 76- that encircle and are fastened to the spindle head near the rear end is a large gear or sprocket wheel 77, and mounted. on a shaftv 78 that is provided with a driving pulley 79 is a small gear or.

sprocket wheel 80. These gears may be made to mesh together but it is preferred dex plate.

that they be connected by a sprocket chain 81. The large gear wheel has interior ear teeth and meshing with these are the teet of the pinions 52 which are keyed to the spindles. The rotation of the large gear wheel through these pinions rotates all of the spindles simultaneously in the same direction andalso tends to rotate the spindle head (Figs. 2,3). v

Fastened to the rear end of the spindle head is a disk 83 provided with index notches 84. Alever 85 mounted on a shaft 86 supported by-the casing has a roll 87 that is adapted to enter the index notches and lock the index disk. A spring 88 is arranged to hold thislevenwith the roll against the periphery of the index disk and in a locking notch (Fig; 3). On' the inner end of the shaft 86 is an arm 89 that has a wedge 90 on its upper end. Projecting rearwardly from the worm wheel on the cam drum is a stud with a roll 91. This roll'is adapted to engage the wedge and, rock the. arm in such manner as to withdraw the locking roll on the end of the locking lever from a notch in the index plate (Figs. 3, 15).

When the index late attached to the spindle head is unloc ed by the engagement of the roll on the worm wheel with the wedge at theend of the rocker arm, thestrain incident to the rotation of thespindles by the engagement of the interior gear with the s indle pinions and alsothe friction between the interior of the cam drum and the cylind'er on which it turns causes the spindle head to rotate in the same direction as the cam drum. This movement of the spindle head continues until the roll on the end of the locking leverv enters the next index notch and stops the movement of the spindle head until the cam drum has made a complete revolution and the .roll again unlocks the in- The pinions meshing with the interior of the large sprocket gear in the manner described tend to rotate the spindle head and they also form a sort of roller bearing for the spindle head so that it rotates easily.

The index locking lever 25 is provided with a handle 92 by means of which the .index may be unlocked in order that the spindle head may be rotated by hand when desired Fig.3). If-the machine is set so that all of the feed tubes are to feed simultaneously it is unnecessary to have the spindle head rotated and to prevent the spindle head from rotatingthe stud and roll 91 may be removed from the worm wheel andthen the spindle head remains locked in one position bythe index and'index locking lever. .It is not necessary, however, to withdraw the stud and roll for if the spindle head continues to rotate the feed tubes will be reciprocated simultaneously 'just the same, only instead of presenting the stock to the same tools ing, cutting off, or the like tools, may be against the lower side of the box for the puroutwardly (Figs. 2, 4).

. feeds-'the-tools radially toward. the stock that is fed through and rotated by and relongitudinal movement on each threading I When the inner tube is pushed forwardly the frictionpulley 111 is engaged with-a friction is a spindle 100that on the front end hasv which will produce thedesired cut. This next t0ol.-

Any desired character of forming, knurlfastened to radially movable slides 93 supported by boxes 94 that are secured to the front end of the casing whichsurrounds the spindle head! Each of these boxeshas a cylindrical hub 95 which extends into an opening in the casing and is held therein by a-binding pin 96. A set screw 97 may be screwed through a lug 98 on the casing pose of adjusting the tool with relation to the stock and also holding thejbox so that it will not turn on its hub under the strain due tothe rotation of the stock against the tool. Springs 99 are arranged to'draw the slides Extending through the hub of each box,

a-cam 101 which engages a stud 102- projecting' from the tool, slide and on the rear end has a gear 103. Each gear 103 on a cam spindle meshes with a pinion 104 that 'which meshes with gear teeth 106 that are cut on the ex- The rotation of thecam drumthrough these gears and cams moves the slides inwardly and volved with the several tubular spindles (Figs. 2, 4). I

The tool holder 45 has holes 107 in which may be secured the-shanks of any tools holder with these tools is fed toward and from the rotating stockby the reciprocation of the shaft 50 which is occasioned by cams onv the cam drum as described. An ear 108 extends downwardlyfrom the tool holder about the shaft 50 for the purpose of guiding and assisting in supporting the holder during its movements (Figs. 11, 13).

Opposite the two lower stock spindles and extending-.through the two lower holes of the tool holder in the machine-illustratedin the drawings are two similar threading tool holders 109. Each of these tap and die holders which are independent of the tool holder is held by andhas a longitudinal movement in a tubular spindle 110 that is rotarily mounted in the tool holder supporting frame. Mounted so as to have a slight spindle is a friction pulley 111. In the in-v terior of each threading spindle and having a slight longitudinal movement therein is a tube 112 and the friction pulley 11.1 is fas tened to this inner tube by screw pins'113.

' pulleys.

pulley 114 that is attached to a-pinion 115 which meshes with a gear 116 keyed to the Shaft 78 (Figs. 11, 12, 13).

On each spindle 110 is a sleeve 117 and keyed on each sleeve is a pinion 118. Meshing with one of these pinions is a gear 119 and' meshing with the other pinion IS a gear 120, which' gears mesh with two pinions121 that are keyed to the shaft 78. It is preferred to employ two pinions 121 so that the sizes I of the pinions and the intermeshing gears may be varied in order to change the relative rates of rotation of the threading spindles.

Projecting from the pinions 118-are clutch studs 122 and projecting from the friction pulleys 111 are'clutch studs 123 (Figs. It;

When the friction'pulleys 111 are moved forwardly so asto engage the friction pulleys v I f 114, the threading spindles are rotated rap idly, of the stock spindles, by means of the friction drawn back and-disengaged fromthe friction in fact, more rapidly thanthe rotation- When the friction pulleys 111 are pulleys 114 the clutch pins on the friction pulleys 111 engage withthe clutch pins on the pinions 118 in such manner that the threading spindles are rotated positively in thesame direction but more when rotated by the friction pulleys, in fact, more slowly than'the rotation of the stock spindles. These parts are so designed that the threading spindles always rotate in the same direction as the stock spindles, thus when the threading tools'are applied to the stock, if the stock rotates faster than the threading tools, threads will be out on the stock. .However, when the positive drive through the gears is released and the threading spindles are rotated by the friction pul leys the tools belng in thesame direction but much slowly than speed of rotation of the threading faster than therotation of the stock spindles, the threading tools will be turned off frorbn the threads which they have cut on the sto k.

Fastened the rear end of each threading tube 112 is a spool 124. At one end of each spool is a beveled flange 125.. A spring plunger 126 is arranged to press against-the opposite s'idesof this flange in such manner that when the spool is shifted for the purpose ofmoving the inner tube the movement, willbe accelerated and the tube will be held in the position to which it is moved. When the spool is drawn back and the plunger is in front of the beveledflange, as shown on the lower spin die, in Fig\ 12, the friotion'pulley 111 is disengaged from the,f riction pulley 114 and the clutch studs are engaged connecting the friction pulley 111 with the pinion 118 so that the threading spindle will be positively rotated by the gearing. When a spool. is pushed forward and the spring plunger is behind the beveled flange, as shown on the upper spindle in Fig. 12, the friction pulley 111 is pushed forward disengaging the clutch pins and engaging the friction pulley 111 with the friction pulley 1 14 so that the threading spindle will be rotated by the friction pulleys.

Clampedto. the rear end of the shaft 31 is a T-shaped head 127. Supported by each outer GIldrOf the upper portion ofthis head is a rocker shaft 128 with a downwardly projecting arm 129' and an upwardly projecting lug 130. The lower end of the arm lies in thepath of the rear end of the rod"131 that is connected with a threading tool holder- 109 and the upper end of the lug extends into an oblique slot in a plate 132 that is attached to the frame,(Figs. 11, 12, 14).

As the shaft 31 moves forward the lower ends of the downwardly projecting rocker arms strike the rear ends of the rods 131 just sufficiently to start the threading tools onto .the stock. After the threading tools are ing cut the inner tubes are pushed forwardlyv so as to cause a disengagementof the clutches which rotate the threading tools slowly for the purpose of threadin the stock, and cause the engagement of tie friction pulleys which rotate the threading tools rapidly and cause them to turn off from the stock which they have threaded '(Figs. 11, 12, 14) As the threading .tool holders are loose in the threading spindles they allow the threading tools to' follow the threads without danger of injuringthe tools or threads.

Carried by the downwardly 'proj ecting arm of the T-shaped frame which is attached to the shaft 31 are rods 134 with heads 135 at oneend and threaded'nuts 136atthe other end. The heads are adapted to engage flanges 137 on the rear ends of the spools -so that as the shaft with the T-shaped head is drawn backwardly the rod heads will engage the flanges and draw the spools and tubes backwardly and cause an engagement of the clutches in such manner that the threading tools will be rotated positively at the thread ing speed. The nuts are adjusted on the ends of the rods so that the heads will cause the shlfting of the parts at the proper time to effect the desired result (Figs- 1.1, 12). With'this arrangement the threading tools can be started on and off the stock at any time for they are moved independently. of

any of the other cutting tools, in fact, a

When these nuts engage the rear" threading die can be backed off in such mannerthat another tool can be operating on the stock which is. in the threading position, which permits the use of a cutting or. forming tool for each spindle, besides the threading tool. 4

If desired either one or both of the threading tool holders may be removed and other tools may be fastened in the openings in the .tool holder through which the threading tool holders extend, or more threading tool holders may be arranged to extend through other openings in the tool holder, and of course the threading tool holders could be used to hold other tools, such as drills or reamers.

If the stock is fed through all of the spindles simultaneously five like pieces, or five pieces of diflerent length, diameter and design can be, made at one revolution of the cam drum, and if the stock is fed successively many different operationsmay be performed on each piece during one revolution of the cam drum.

j The invention claimed is 11 A screw machine having a rotatable head, spindles carried by the head, mechanism for rotating the spindles, means for feed.- ing a rodthrough each spindle, means for clamping a rod ineach spindle, mechanism for operating the feeding means, mechanism for operating the clamping means, adjustable means for connecting the feed operating mechanism with either one or all of the feeding means, and adjustable mechanism for I spindle head, mechanism for rotating the connecting the clamp operating mechanism with either one or all of the clamping means whereby the feeds and clamps may be oper ated'singlywr collectively, substantially as specified. g

2. A screw machine having a rotatable spindle head, mechanism for rotating the head, spindles carried by the head, mechanism for rotating the spindles, means for feeding a rod through each spindle, means for clamping a rod in each spindle, mechanism for operating the feeding means, mechanism for operating the clamping means, and

means constructed to connect the feed operating mechanism with either one or all of the feeding means and coincidently connect the clamp operating mechanism with one or all of the clamping means so that when the feeding means are operated singlythe clamping means will be operated singly but when the feeding means are operated collectively the clamping means will be operated collectively, substantially as specified.

3. A screw machinehaving a rotatable spindle head, spindles carried by the head, mechanism that encircles and is mounted directly upon the head and engages the head and the s indles so [that it rotates the spin dles and a so rotates the headboth by direct friction and throughthe spindles, means for feeding a rod through each spindle, means for clamping a rod in each spindle, mechanism for operating the feedin means, mechanism for operating the c amping means,

means for connecting the feed-operatin mechanism with the feeding means, an means for connecting the clamp operating mechanism with the clamping means, sub- 2 stantially as specified. I 4 A screw machine'having a rotatable spindle head, mechanism for rotating the head, spindles carried by the head, mechanism for rotating the spindles, feed tubes movable longitudinally in the s indles,

, 1 5 mechanism for reciprocating the fee tubes, 'chucks'carried by the spindles, mechanism for closing the chucks, and anadjustable l device constructed to in oneposition connect the'feed'tube reci rocating mechanism zo'with only one feed tu e and to in another position connect the feed tube reci rocating 'mechanism with all of the feed tu es,',sub-

stantially as specified.

5. A screw machine having a rotatable spindle head, mechanism for rotating 'the head, spindles carried by the head, mechan ism for rotating the spindles, feed tubes .movable longitudinally in. the s indles,

Y mechanism'for reciprocating the fee tubes,

' 3'0 chucks carried by the spindles, mechanism for closing the chucks, and rotarily adjustable and longitudinally movable means which in one position connect the feed tube reciprocating mechanism with and cause the feed of only one feed tube and in another p0- -sition connect the feed tube reciprocating mechanism with all and cause the simul-" taneous feed of all the feed-tubes, substan- 1 tially as specified. 4'0, 6. A screw machine having a rotatable spindle head, mechanism for rotating the head, spindles carried by the head, mechan- -ism'for rotating the spindles, feed tubes movable'longitudinally inthe s indles, mechanism that includes a shaft or reciprocating the feed tubes, chucks carried by thespin-- dles, mechanism for closing the chucks, a

collar onsaid. shaft and bearing projections which are adapted to connect the collar with thefeed tubes, and a bindin screw adjustably connecting the collar wit the shaft,

, substantially as specified.

'7. A screw machine having a rotatablespindle head, mechanism for rotating the head, s indles carried by the head, mechanism 'or rotating the spindles, feed tubes movable 'longutudinally in the epin'dles,

mechanism for reciprocating the fee for closing the chucks,mechanis m adapted to actuate one chu'ckclosing mechanism, and

an adjustable device which in one position- .tubes,. chucks carried bythe spindles, mechanism' to actuate one chuck closing mechanism, and rotarily adjustable and longitudinally movable means which when rotated into one position permits the chuck closing mechanisms to operate individually but when rotated into anotherposition is reciprocated the movement of'one chuck closin mechanism and causes the movement of a l of the I other chuck closing mechanisms, substantially as specified. I

9. A screw machine having a rotatable spindlehead, mechanism for rotating the ,head, spindles carried by the head, mechans .ism for rotating the spindles, feed tubes movable longitudinally in the spindles,

mechanism for reciprocating'the feed tubes, chucks carried by the spindles, mechanism for closing the chucks, a rotatable and longitudinally movable part which when rotated to one position connects the feed tube 5 reciprocatin mechanism with only one feed tube and w ich-when rotated to another position connects the feed tube reciprocating mechanism with all of the feed tubes, and a rotatable and longitudinally movable device 00,

connected so as to be rotated 'by'the rotation of the said rotatable and longitudinally movable part and having means which in one position permits the chuck closin mechanisms to be operated independently ut which in 5 another position connects all of the chuck closing mechanisms so that all the chucks 1grill operate -together, substantially as specied. i 10. A screw machine. having a rotatable 10 spindle head, mechanism for rotating the head, spindles carried by the head, mechanism for rotating the spindles, means for feeding a rod through each spindle, means for clamping a, rod 1n each spindle, mechanism for operating the feeding means, mechanism for operating the clamping means, means for connecting the feed 0 erating mechanism. with either one or all of the-feeding means and for connecting the clamp operatin mechanism with either one or all of the c amping means whereby the feeds and clamps-may be operated singly or collectively, tool carriers movable toward and from the axes of the spindles, and mechanism for moving the 1 2;,

tool carriers, substantially as specified.

'11. A screw machine having a rotatable spindle head, mechanism for rotating the head, spindles carried by the head, mechanism for rotating the spindles, means for feedclamping means singly or collectively, tool carriers movable radially toward and from feeding a rod through each spindle, means mg) su stantially as specified.

., for operating the feeding means, mechanism I clamping a rod in each spindle, mechanism rounding the head and connected with and 'lvely, mechanism for operating the clamping a rod through each spindle, means for for operating the feeding means, mechanism for operating the clamplng means, tool carriers'movable radially toward the axes of the spindles, and mechanism surrounding the head and connected with and operated by the head rotating mechanism for moving the tool carriers, substantially as specified.

12. A screw machine having a rotatable spindle h'ead, mechanism for rotating the head, spindles carried by the head, mechanism for rotating the spindles, means for feeding a rod through each spindle, means for clamping a rod in each spindle, mechanism for operating the feeding means singly or collectively, mechanism for operating the i the axes of the spindles, and mechanism sur-.

operated by the head rotating mechanism for moving the tool carriers,-substantially as specified. 13. A screw machine having a rotatable spindle head, means for rotating the head, spindles carried by the head, mechanism for rotating the spindles, means for feeding a rod through each spindle, means for clamping a rod in'each spindle, mechanism for operating the feeding means singly or collect- L ing means singly or collectively, tool carriers movable axially of the spindles, and mechanism connected with and operated by the feed operating mechanism'for moving the tool carriers, substantially as specified.

14. A screw machine having a rotatable spindle head, mechanism for rotating the head, spindles carried by the head, mechanism for rotating the spindles, means for for clamping a rod in each spindle, mechan-v ism for operating the feeding means, mechanism for operatlng' the clamping means, adjustable means for connecting the feed 'oper ating mechanism with either one or all of the feedlng means and for connecting the clam operating mechanisms with either one or a l of the clamping means, tool carriers movable axially of the spindles, and mechanism connected with and operated by the feed operatmechanism for moving the tool carriers,

15. A screw machine having a rotatable spindle head, mechanism for rotating the head, spindles carried by the head, mechanism for rotating the spindles, means for feeding arod through each spindle, means for clamping a rodin each spindle, mechanism for operating the clamping means, means for connecting the feed operating mechanism with either one or all of the feedingmeans and for connecting the clamp operating mechanism with either one or all of the clamping means, tool carriers movable rathe tool carriers axially, substantially as specified.

16. A screw machine having a rotatable spindle head, spindles carried by the head, means for feeding rods through the spindles, means for clamping rods in the spindles, pinions on the spindles, a gear encircling and in frictional contact with the head and engaging the spindle pinions and adapted to rotate the head by direct friction and also through the pinions, a cam drum encircling and rn frictional contact with the head, and

cams carried by the cam drum for operating the clamping means, substantially as speci- 17. A screw machine having a rotatable spindle head, spindles carried by the head, means for feeding rods through the spindles, means for clamping'rods in the spindles,

pinions on the spindles, a gear encircling and irifrictional contact with the head and engaging the spindle pinions and adapted to revolve the head by direct friction and also through the pinions, a cam drum-encircling and in frictional contact with the head, cams carried by the cam drum for operating the clamping means, tool carriers movable radially towardthe axes of the spindles, and mechanism connected with and operated by the cam drum for moving the tool carriers radially, substantially as specified.

18. A screw machine having a rotatable spindle head, spindles carried by the head, means for feeding rods through the spindles, means for clamping rods in the spindles,

pinions on the spindles, a gear encircling and in frictional contact with the head and engaging the spindle pinions and adapted to revolve thehead by direct friction and also through' the pinions, a cam drum encircling and in frictional contact with the head, cams carried by the cam drum for operating the clamping means, tool carriers movable axially substantially as specified.

19. A screw machine having a rotatable toward and from the spindles, and mechanspindle head, spindles carried by the head,

means for feeding stock through the spindles,

means for clamping .stock in" the spindles,

mechanism for rotating the spindles, a cam drum encircling the head, mechanism for rotating the cam drum, cams carried by the cam drum for operating the clamping means, tool carriers movable radially toward and from the axes of the spindles, and mechanism connected, with and operated by the cam drum for moving the toolcarriers radially, substantially as specified. i

20." A screw machine having a rotatable spindle head, spindles carried by the head, means for feeding stockthrough the spindles, means for clamping stock in the spindles, mechanism for rotating the spindles, a camdrum encircling the head, mechanism for rotating the cam drum, cams carried by the cam drum for operating the clamping means, tool carriers movable axially toward and from the spindles, and mechanism connected with and operated by the cam drum for moving the tool carriers axially, substantially as specified.

21. A screw machine having a rotatable spindle head, spindles carried by the head, means for feeding stock through the spin dles, means for clamping stock 'in the spin-' dles, mechanism for rotating the spindles, a cam drum encircling the head, mechanism for rotating the cam drum, cams carried by the cam drum for operating the clamping means, tool carriers movable radially toward and from the axes'of the spindles, mechanism connected with and operated by the cam drum for moving the tool carriersradially, tool carriers movable axially toward and from the spindles, and mechanism connected with and operated by the cam drum for moving the tool carriers axially, substantially as specified. 1

22. A screw machine having a rotatable spindle head, spindles carried by the head, an annular gear encircling the head and. rotatable thereon and geared to the spindles and adapted to rotate the head, a cam drum adapted to rotate the head by encircling the head, an index disk attached to the head, mechanism for locking the index disk, and means carried by the cam drum for releasing the index locking mechanism, substantially asspecified. r 23; A screw machine having a rotatable spindle head, spindles; carried by the head, means for feeding stock through the spindles, means for clamping stock in the spindles, mechanism for rotating the spindles, mechanism for rotating the head, a cam drum encircling the head, an index disk attached to the head, mechanism for locking the index disk, and mean s'carried by-the cam drum for releasing the' index locking mechanism,

substantially as specified.

24. A screw machine having a "rotatable spindle head, spindles carried by the head, means for feeding stock through the spin dles, means for clampin stock in the spindles, pinions on the s'pim les, an annular gear encircling and in frictional contact with the head and engaging the spindle pinions and directfriction and also through the pinions, an index disk attached to the head, mechanism for locking the index disk, and means for releasing the as specified.

index disklocking mechanism, substantially spindle head, bearings; at each end of the head, s indles supported by the bearings at the en s of the head, means for feeding stock spindles, a cam drum encircling the head,

means carried by the cam drum foroperating "itihe1 clamping means, substantially as speci 26. A screw machine having a'rotatable spindle head, bearings at each end ofthe head, s indles supported by the bearings at anism for rotating the cam drum, and means carried by'the cam drum for operating the clamping means and for operating the feeding means, substantially as specified.

28. A screw machine having a rotatable mechanism for rotating the head, mechanism for rotating the spindles, means for feeding stock through the spindles, means for clamping stock in the spindles, a drum encircling the head, .a gear carried by the drum,,mechanism for rotating the gear, too'l carriers movable radially toward the axes of the, spindles,

as specified. 29. A "screw machine having a rotatable spindle head, spindles carried by the head,

for clamping stock in the spindles, a, cam

drum encircling the cam drum, mechanism for rotating the drum,-tool carriers movable radially toward the axes of the spindles, gearing connecting carriers, tool carrierslmovable axially toward the axes of the spindles, andmechanisrn for movin the tool carrier's axiall 25.- A screw machine having a rotatable.

through the spindles, means for clamping stock in the spindles, mechanism for rotating the head, mechanism for rotating the,

,75 mechanism for rotating the cam drum, and

spindle head, spindles carried'by the head,

the cam drum and the radially movable tool the en s of thehead, means for feeding rods through the spindles, means for clamping cam drum encircling the vhead, mechfor rotating the cam drum, and cams dles, acam drum encircling the head, mechand gearing connecting the drum and; the radially movable toolcarriers, substantially mechanism for'rotating the spindle head,'. mechanism for rotating the spindles, means for feeding stock through the's'pindles, means 1 the head, a gear carried by operated from t e cam drum, substantial y as speci- 30. A screw machine having a rotatable head, spindles carried by the head, mechanism for rotating the head, mechanism for rotating' the spindles, means for feeding rods through" the spindles, means for clamping rods in the spindles, a camdrum encircling the head, a gear carried'by the cam drum,

operating the feeding means, substantiallyas specified.

31. A screw machine having a rotatable spindle head, spindles carried by the head, mechanism for rotating the head, mechanism for rotating the spindlesymeans for feeding rods through the spindles, means for clamping rods in the spindles, a cam drum encircling the head, tool carriers movable axially toward the spindles, and mechanism operated from the cam drum for moving the tool carriers axially and for operating the feeding means, substantially as specified.

32. A screw machine having a rotatable spindle head, spindles carried by the head, mechanism for rotating the head, mechanism for-rotating the spindles, a cam drum encircling the head, means for feeding rods through the spindles, mechanism for operating the feeding means, means for clamping rods in the spindles, mechanism for operating the clamping means, and camscarried by the drum for actuating the feed operating mechanism and the clamp operating mechanism, substantially as specified.

33. A screw machine having a rotatable spindle head, spindles carried by the head, an annular gear encircling the head and rotatable relatively thereto, geared to the spindles and adapted to rotate the head, feed tubes in the spindles, chucks carried by the spindles, a drum encircling thehead, mechanism for reciprocating the feed tubes, mechanism for closing the chucks, and means-carried by the drum for operating the feed tube mechanism and the chuck mechanism, substantially as specified.

3 4. Ascrew machine'having arotatable spindle head, spindles carried by the head,

an annular gear encircling the headand'rotatable relatively thereto, geared to-the spin.-

dles and adapted to rotate-the head, a drum encircling the head, means for feeding rods through the spindles, means for clamping rods in the spindles, mechanism connected,

with and operated by the drum for op'erating the feeding means, mechanism connected with and operated by the drum for o erating the clamping means, an index dis fastened to the'head, mechanism for locking the- "annular gear encircling the head and rotatable relatively thereto, geared to the spindles and adapted to rotate the head, a drum encircling the head, means for feeding rods through the spindles, means for clampin rods in the spindles, mechanism connected with and operated by the drum for operatin the feeding means, mechanism connected with and operated by the drum for operatin the clamping means, an index disk fastene to the head, mechanism for locking the index disk, means carried by the drum for releasing the index locking mechanism, tool carriers movable radially toward the spindles, and gearin connected with and operated by the drum or moving the tool carriers, subs. 1ntially as specified. i

36. A screw machine having a rotatablespindle head, spindles carried by the head, an annular gear encircling the head and rotatin relatively thereto, geared to the spindles an adapted to rotate the head, a cam drum, en-' ism, tool carriers movable radialy toward the axes of the spindles, gearing connected with and operated by the cam drum for moving the tool carriers radially, to ol carriers movable axially toward the spindles, and mechanism connected with and operated by the cam drum for moving the tool carriers axially, substantially as specified.

, 37 A screw machine having a rotatable spindle head, spindles carried by the head, a tube for feeding and through each spindle, a

chuck for clamping a rod in each spindle, a i

reciprocating mechanism for moving the feed tubes, and adjustable means movable with the-reciprocating mechanism which is adapted to be enga ed with and to actuate onl one of the fee tubes or to be engaged'wit and to actuate all of thefeed'tubes, substantially as specified.

38. .A screwmachine having a rotatable spindlethead, spindles carried by the head, a tube for feeding a rod through each spindle, a chuck for clamping a rod in each spindle, reciprocating mechanism 'for moving the tubes, and a rota device movable with the reciprocating. mec anism and bearin projections which may be engaged with 0 y one of the feed tubes or which may be en aged with all of the feed tubes, substantia ly as specified.

' 39. A screw machine having a rotatable spindle head, spindles carried by the head, a tube for feeding a rod through each spindle, a chuck for clamping a rod in each spindle, an adjustable flanged sleeve on each tube, an

. adjustable collar on each sleeve, a reciprocawhich are adapted to be engaged with only ,tory shaft and a rotary collar angularly adjustable on the shaftand bearing projections one of the feed tube flanges and collars or to be engaged with all of the feed tube flanges and collars, substantially as specified.

. 40. A screw machine having a rotatable.

] spindle head, spindles carried by the head, a

- movable with thetube feeding mechanism,

tube for feeding a rod through each spindle, a chuck forclamping a rod in each spindle, a

reciprocating tube feed mechanism, mechan ism for closing the chucks, adjustable means said means when adjusted toone position engaging and actuating'only one of the feed tubes and when adjusted to another position engaging and actuatingall of the feed tubes, and a device connected with said means so as to move therewith and adapted to connect or disconnect one ofthe chuck closing mechscrew-machine having a rotatable spindle head, spindles carried by the head, a

tube for feeding a rod through-each spindle, a chuck for clamping a rod in each spindle, ad-

justable mechanism adapted to reciprocate one or all of the feed tubes, and mechanism A connected with the tube reciprocatingmechanism adapted to close one or all of the chucks, substantially as specified.

avin

43.- A screw machine a rotatable spindle head, 'spindles carried y' the head,

means for feeding stock through the spindles, means for clamping stock in the spindles, pinions on the spindles, a gear loosely mounted on and in frictional engagement with the head and engaging thespin 1e pinions so that when rotated 1t -rotates the head by direct v friction and also through the pinions, and re- -tate's the spindles through the pinions, substantially as specified. I

-' 44. A screw machine having a rotatable spindle head, "bearings at eac endof the head, spindles supported near their ends b the bearings atthe ends of the spindle hea means for feeding rods through the spindles, means for clamping rods in the ions on the spindles between e bearings, and a gear -mounted between the bearings and in frictionafiengagement with the head and 'engagin the spindle pinions so that when'rotate it rotates the head by direct friction also through the pinions and rotates the spindles through the pinions, substantially as specified.

, 45.. A screw machine having a rotatable s indles pintii spindle head, spindles carried by the head,

pinions mounted on the spindles, and a gear encircling the spindle head and the pinlons" on the spindles, said ear being frictionally engaged with the spindle head and geared to the spindles so that by its rotation it positively rotates the spindles and rotates the head by reason'of the friction between the gear and the head and between the spindles and the head ,substantially as specified.

46. A screw machine havin a rotatable spindle head, spindles carried iy the head, means for feeding stock through the spindles, means for clamping stock in the spindles, a gear loosely mounted on and in frictional engagement with the head and adapted by its. 'rotation to rotate the spindles and to rotate the head through the'spindles and by direct friction between the geag and the head, an index disk fastened to the head, mechanism for locking the index disk, and means for reipasing the index disk, substantially as speci- 47. A screw machine having a rotatable spindle head, spindles carried by the head,

means for feeding stock through the spindles,

means for clamping stock in the spindles, pinions on the spindles, bushings encircling and secured to the head, an internal gear fitting the bushings and meshing with the pin- .ions on the spindles, and means for rotating the internal gear, substantially as specified.

48. A screw machine having a rotatable spindle head, bearings at each end of the head, spindles supported near their ends by the bearings at the end of the spindle head, pinions on the spindles between t ebearings, a gear having internal teeth meshing with the pin ions, and external teeth, said gear being mounted on and'in frictional contact with the periphery ofthe headbetween the bearings, a drivin gear, and a driving chain encircling 'the riving gear and the external gear, substantially as specified.

' 49. A-screw machine having a rotatable spindle head, bearings at each end of the head, spindles supported near their ends by the bearings at" theends of the head, means for feeding rods through'the spindles, mechanism for operating the feeding means,

chucks in the spindles adjacent to the forward bearings for clamping rods in the spindles, mechanism located in the head between the bearings for operating the chucks, and

as specified.

gearing between the bearings for rotating the spindles and rotating the head, substantially 50. A screw machine having a rotatable spindle head, bearings at each end. of the head, spindles supported near their ends by thebearings at the ends of the head, -means for feeding rods through the spindles, means for clamping rods in the s indles, mechanism for rotating the spind es, a gear encircling the head between the bearings and in frictional contact with the periphery thereof, a driving pinion below the head, and a connection between the driving pinion below the head and thegear that encircles the'head, substantially as specified.

51. A screw machine having-a rotatable spindle head, bearings at each end of the head, spindles supported near their ends'by the bearings at the ends of the head, means for feeding rods through thes indles, means for clamping rods in the s ind es, pinions on the spindles between the earings, an internal and external gear encircling and in frictional contact with the periphery of the head between the bearings and engaging the pinions, a driving pinion below the head, and a chain connecting the driving pinion and the external gear encircling the head, substantially as specified. v

52. A screw machine having a rotatable spindle head, spindles carried by the head,

mechanism for rotating the spindles, means for feeding stock through the spindles, means for-,clampin stock in the spindles, tool carriers movab e axially toward the spindles, a cam drum encircling and movable on the periphery of the spindle head and adapted to rotate the head and to feed the tool carriers axially toward th'e spindles, and mechanism for rotating the cam drum, substantially as specified.

53. A screw machine having a rotatable spindle head, spindles carried by the spindle head, mechanism for rotating the spindles, means for feeding stock throughthespindles, means for clamping stock in the spindles, tool carriers movable toward the spindles, a cam drum encircling and in frictional contact with the periphery of the spindle head, mechanism for rotating the cam drum, an index disk fastened to the spindle head, mechanism for'locking the index disk, and mechanism operated by the cam'drum for moving the tool carriers toward the spindles, substantially as specified.

54. A screw machine having a rotatable spindle head, spindles carried by the head,

pinions on the spindles, an internal and external gear encircling and in frictional contact with the each side of t e internal gear and meshing with the spindle pinions, and a driving pinion below the spindle head and connected periphery of the spindle head with the external gear, substantially as specified.

55. A. screw machine having a rotary spindle head, mechanism for rotating the head, spindles carried by the spindle head, mechanism for rotatihg the spindles, means for feed: ing, stock through the spindles, means for clamping stock in the spindles, a threading toolv holder movable axially of a spindle, mechanism for rotating the threading tool holderin the same direction but slower than the spindles, mechanism for rotating the threading tool holder in the same direction but faster than the spindles, clutches for connecting the rotating mechanisms with the spindles, and mechanisms actuated by the forward movement of the tool holder for automatically shifting the clutches from one tool holderrotating mechanism to the other tool holder rotating mechanism, substantially as specified.

56. A screw machine having'a rotary spindle head, mechanism for rotating the head, spindles carried by the spindle head, mechanism for rotating the spindles, means for feeding rods through the spindles, means for clamping rods in the spindles, a threading tooLholde'r movable axially of the spindles, mechanism for rotating the threading tool holder in the same direction but slower than the 's indles, mechanism for rotating the threa ing tool holder in the same direction but faster than the spindles, clutches for connecting the rotating mechanisms with the spindles, and mechanisms actuated by the forward movement of the tool holder and forward of the rod feeding mechanism for automaticallyshifting the clutches-from one tool holder rotating mechanism to the other tool holder rotating mechanism, substantially as specified. J

57. A screw machine having a rotatable spindle head, mechanism for rotating the head, spindles carried by the spindle head,

mechanismfor rotating the spindles, means -for'feeding rodsthrough the spindles, means for clam ing rodsin thes indles, a threading tool hol er movable axial y of a spindle, friction pulleys for rotating the threading tool holder in the same direction but faster than the s indles, and gears for rotating thethrea ing tool holder in the same direction but slower than the spindles, substantially as specified. I Y I 58. A screw machine having a rotatable spindle head, mechanism for rotating the head, spindles carried by thehead, mechanism for rotating the spindles, means for feed ing rods through the spindles, means for clamping rods in the .splndles, a threading tool holder movable axially of a spindle, friction pulleys for rotating thethreading tool holder in the same direction but faster than the spindles, gears for rotating the threading I at the limits of/the tool holdei in the same direction but slower than the spindles,

I friction pulle movable on the threading tool holder s ind e, means for rotating the friction 111 ey, a pinion fixed on the threading tool older, means for rotating the pinion,

and mechanism actuated by the forward movement of the tool holder and forward movement of the rod feeding mechanism for automatically connecting and disconnecting the movable friction pulley and the fixed pinion on the threading tool holder, substantially as specified.

60. A screw machine having a spindle head supporting a ca'si'ng with recesses in its forward end, tool boxes having hubs inserted 'in said recesses, tool carriers movable in said boxes, a shaft 'extendingthrough each hub, a

cam on one: end. of each shaft for moving the -tool carriers, and gearing at the other end of the shaftsfor rotating the cams, substan.

tially as specified.

61,- A screw machine :having spindle head supporting a casing with recesses in itsv forward end, tool boxes having hubs inserted in said recesses, tool carriers movable in said boxes, a shaft extending through each hub, a

I cam on one end of each shaft for moving the tool carriers, and mechanism for rotating the shafts, substantially as specified.

62. A screw machine having a spindle head supporting a casing with recesses in its forward end, tool boxes having cylindrical hubs inserted in said recesses, screw studs butting against the edges of the boxes to. prevent them from rotatin on their hUbSytOQl carriers movable in sai boxes, a shaft ex- I and gearing at the other end of each shaft for tending through eachiiub, a cam'on one end of each shaftfor movingthe. tool carriers,

rotating the cams, substantially as specified.

63. A screw machine spindle com rising a tubular spindle, a tubular spindle ining, a

chuck at the forward end of the lining, a

- chuck closing sleeve between the lining and chuck and thes indle, a feed tube movable in thelining, a anged sleeve adjustable .on

the rear end of the feed tube, and a collar adjustable on the sleeve, substantially as.

specified.

64. -A screw'machine spindle com rising a 'tubular spindle, a tubular spindle ining, a

- chuck at the forward end pf the, lining, a

.and' studs extending from the collar t the spindle into bayonet slots in the chuckwhereby by turning the closing be removed and the chuck i thestuds during a portion chuck closing sleeve between the lining and chuck and the s indle, a feed tube movable in the lining, a anged sleeve adjustable on the rear end of the feed tube,

raduations adjustable'on the sleeve, and a nger arranged to cooperate with the graduaa' collar bearing tions for indicating the adgustment ofthe collar, substantially as speci ed.

65. A screw machine spindle com rising a tubular spindle, a tubular s indle ining, -a chuck at the forward end of t e lining, a feed tube movable in the lining, a chuck closing sleeve between the linin and chuckand the spindle, means for moving rough closing sleeve sleeve it can drawn out, substantially ass ecified.

66. A screw machine spindle com tubular spindle, a tubular s indle. inin chuck at the forward end of th a collar mova le on the spindle,

the collar on the s indle,

rising a a elining, a eed tube movable in the lining, a s lit friction A sleeve at theforward end of the eed tube, a

chuck closing sleeve between the linin and chuck and the spindle, a collar movab eon the spindle, means the spindle, and studs extending from the collar through the spmdleinto bayonet slots V ing the closing sleeve it can be removed and drawn out, substantially as speclin the chuck closing sleeve whereby by turnthe chuck fied. v 67. A screw machine having a. rotatable spindle head, mechanism for rotating the head, spindles carried by the ism for rotating the spindles, means for feeding rods through the spindles, mechanism for o crating thefeeding -m'eans, chucks for. c am ing rods in the spindles, levers for closiing t e chucks, wedges for operating the lethe wedges,

vers, sleeves with cam grooves on p a cam drum encircling the head, mechamsm for rotating the cam drum,

grooves'in the sleeves on the c wedges, and a fixed with the cam drum, substantially as specified. 68. A screw machine having a rotatable the head, mechana tool carrier means for head, spindles carried by ismfor rotating the spindles, movable axiall of the spindles, feeding rods't ough thes indles, and shaft exte ding centrally of t and ,the ax ially movable toolh able with the axially movable operating the feeding means,

69. A screw machine having a rotatable spindle head, mechanism for rotating the for moving the collar on studs carried by the cam drum and adapted to en age thec'amhuck closing wedge adapted to engage of their-revolution n e spindle head older and movtool holder for substantially as head, mechan- 1 1 5 spindle head, mechanism for rotating the" head, spindles carried by the head, mechan- '1 ism for feeding rods through the spindles, mechanism for clamping rods in the spindles,

anism for moving the threading too holder backwardly, substantially as specified.

70, A screw machine having a rotatable spindle head', spindles carried by the head, mechanism for rotating the, head, mechanism' for rotating the spindles, means forclamping work in the s indles, a drum encircling the head, means or rotating the drum, a-tool carrier movable radially toward and from the axis of one of 'the spindles and co nections between the drum. and tool calyiia r so arranged as to cause operation of the tool carrier from the driim.

71. A screw machine-having a rotatable spindle head, spindles carried by the head,

mechanism for rotating the s indles, means for clamping work in the spin les, a tool carrier inovab e contact with the periphery of the spindle head; mechanism for rotating the drum, in-

dexing notches on the spindle head, mechanism engaging the notches for locking the head and mechanism operated by the drum for moving'the tool carriers, substantially'as specified. HARRY B. LESTER.

Witnesses: i

HARRY R. WILLIAMS, ETH L M. LowE.

toward and from one of thespindles, a drum encircling and in frictional 

